A102923 Row sums of triangle A102920, which equals the matrix square of A102098.

1, 7, 85, 2369, 127796, 11417607, 1536493698, 292107021267, 74862835208823, 24954353268384100, 10517125257007205287, 5477412008465124456814, 3459179319447147792978276, 2607366906177104506271124036

Offset: 0

Author

Paul D. Hanna, Jan 21 2005

Keywords

• nonn

Comments

Triangle A102098 shifts each column up 1 row under matrix cube.

Crossrefs

Cf. A102920, A102098.

Programs

PARI

{a(n)=local(A=matrix(2,2),B);A[1,1]=1; for (m=2,n+1,B=matrix(m,m);for (i=1,m, for (j=1,i, if(j==i,B[i,j]=j,B[i,j]=(A^3)[i-1,j]);));A=B); return(sum(k=0,n,(A^2)[n+1,k+1]))}